Percy listened to the explanation, simultaneously horrified and impressed. He could imagine that scale of destruction with magic, with a mage who was mad enough. The explosion at Pyrah, the remains of Glintshore, the destruction wrought by Thordak, the poisoned Feywild of Saundor's madness. But hundreds of years of it caused by science? That was the sort of thing that he had nightmares about unleashing on the world. "It sounds like a blight spell."